Roosevelt Reservoir, also known as Green Lake Reservoir, is a vital water resource located within Seattle City Limits in King County, Washington.
Wind
Humidity
Managed by the Washington Department of Ecology, this local government-owned reservoir was completed in 1910 for the primary purpose of water supply. With a maximum storage capacity of 181 acre-feet and a normal storage capacity of 153 acre-feet, the reservoir covers an area of 8.4 acres and serves as a crucial source of water for the surrounding area.
The dam at Roosevelt Reservoir is of Earth type, with a hydraulic height of 23 feet and a structural height of 23 feet. The reservoir has a high hazard potential but is currently in satisfactory condition, as assessed in April 2021. With a drainage area of 0.01 square miles and a maximum discharge of 45 cubic feet per second, the reservoir plays a key role in managing water resources in the region. Regular inspections are conducted every five years to ensure the safety and functionality of the dam, demonstrating a commitment to proper maintenance and risk management.
As a significant component of the water infrastructure in the area, Roosevelt Reservoir not only provides essential water supply but also contributes to the overall management of water resources in the region. With its strategic location and high hazard potential, the reservoir serves as a critical asset for the community and underscores the importance of effective regulation, inspection, and maintenance practices to ensure the safety and reliability of the water supply system in King County, Washington.
Year Completed |
1910 |
Dam Length |
1920 |
River Or Stream |
Tr-Puget Sound-Offstream |
Primary Dam Type |
Earth |
Surface Area |
8.4 |
Hydraulic Height |
23 |
Drainage Area |
0.01 |
Nid Storage |
181 |
Structural Height |
23 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
23 |
Thornton Creek Near Seattle
|
41cfs |
Mercer Creek Near Bellevue
|
12cfs |
Duwamish River At Golf Course At Tukwila
|
6700cfs |
Cedar River At Renton
|
5160cfs |
Issaquah Creek Near Mouth Near Issaquah
|
300cfs |
Snohomish River Near Monroe
|
28500cfs |
| Location | Reservations | Toilets |
|---|---|---|
Fay Bainbridge State Park
|
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Fay Bainbridge State Park campsite
|
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Cascadia Marine Trail
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